Re: Shuffle Cards Function

http://php.net/shuffle will be much faster and just as random... -- WARNING richard@zend.com address is an endangered species -- Use ceo@l-i-e.com Wanna help me out? Like Music? Buy a CD: http://l-i-e.com/artists.htm Volunteer a little time: http://chatmusic.com/volunteer.htm ----- Original Message ----- From: Robert Schultz <bert@ncinter.net> Newsgroups: php.general To: <php-general@lists.php.net> Sent: Saturday, August 18, 2001 11:37 PM Subject: Shuffle Cards Function > I've written a ShuffleCards function that will actually shuffle a deck of > cards just like would happen in real life (divide the deck in half and stick > them into each other with 1-3 cards between each other card) > > function ShuffleCards(&$cardsArray, $times) > { > // Randomizes where to split within center (-3 to +3 from dead center) > (MINIMUM 10 CARDS IN DECK) > // Splits into two array. Randomizes how many cards from left and how > many cards from right (between 1 and 3) > // Alternates sides. Continues until both arrays are empty. > $arraySize = count($cardsArray); > > if($arraySize<10) > return; > > $deadCenter = $arraySize/2; > > for($i=0;$i<$times;$i++) > { > reset($cardsArray); > > $cutVariant = rand(-3, 3); > $cutLocation = $deadCenter+$cutVariant; > > $firstArray = array(); > $secondArray = array(); > > for($z=0;$z<$arraySize;$z++) > { > if($z<$cutLocation) > array_push($firstArray, $cardsArray[$z]); > else > array_push($secondArray, $cardsArray[$z]); > } > > $bottomFirst = rand(0, 1); > $cardsArray = array(); > > while(count($firstArray) && count($secondArray)) > { > $leftNewCards = array(); > $rightNewCards = array(); > > $leftVariant = rand(1, 3); > if($leftVariant>count($firstArray)) > $leftVariant = count($firstArray); > > $rightVariant = rand(1, 3); > if($rightVariant>count($secondArray)) > $rightVariant = count($secondArray); > > > for($x=0;$x<$leftVariant;$x++) > { > array_push($leftNewCards, array_shift($firstArray)); > } > > for($y=0;$y<$rightVariant;$y++) > { > array_push($rightNewCards, array_shift($secondArray)); > } > > if($bottomFirst==0) > { > $newCardsArray = array_merge($leftNewCards, $rightNewCards); > $bottomFirst = 1; > } > else > { > $newCardsArray = array_merge($rightNewCards, $leftNewCards); > $bottomFirst = 0; > } > > reset($newCardsArray); > > while(count($newCardsArray)) > { > array_push($cardsArray, array_shift($newCardsArray)); > } > } > > if(count($firstArray)) > { > while(count($firstArray)) > array_push($cardsArray, array_shift($firstArray)); > } > if(count($secondArray)) > { > while(count($secondArray)) > array_push($cardsArray, array_shift($secondArray)); > } > } > } > > Robert Schultz - bert@ncinter.net > > >